CN1598559A - Device for detecting slag content of liquid metal orifice - Google Patents
Device for detecting slag content of liquid metal orifice Download PDFInfo
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- CN1598559A CN1598559A CNA031569803A CN03156980A CN1598559A CN 1598559 A CN1598559 A CN 1598559A CN A031569803 A CNA031569803 A CN A031569803A CN 03156980 A CN03156980 A CN 03156980A CN 1598559 A CN1598559 A CN 1598559A
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- liquid metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
- B22D2/001—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass for the slag appearance in a molten metal stream
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9013—Arrangements for scanning
- G01N27/9026—Arrangements for scanning by moving the material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
- G01N33/205—Metals in liquid state, e.g. molten metals
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Medicinal Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Food Science & Technology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Geophysics And Detection Of Objects (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention is a device for detecting dredge content in liquid metal infuse, which is made up of a sensor, signal cable and signal processor. The sensor has a metal shell, in which there arranges with receiving coil, filling layer, transmitting coil and compensating coil, these coils are winded in the spiral grooves on the insulating layer and filling layer, the spiral grooves arranged on the insulating layer and filling layer is formed by moving one-by-one axially along the sensor by insulating plate and insulation filling block with grooves.
Description
The present invention relates to the detection technique of slag content in the liquid metal beam, be specifically related in the casting process from metal smelting furnace or the big pick-up unit that wraps slag content the liquid metal beam that flows out.
In the continuous casting smelting process, will there be slag to flow out the latter stage of flowing out from smelting furnace or big the bag with liquid metal at liquid metal.In order to guarantee the degree of purity of liquid metal, need be at the liquid metal flow export sensor installation of smelting furnace or big bag, the content of slag detects and controls in the liquid towards metal beam.This sensor is the key components of slag content detection device in the liquid metal beam.The electromagnetic sensor of an annular normally is installed around the liquid metal beam.Because sensor installation position temperature is higher, the insulation between the coil is the key issue that electromagnetic sensor is made.AMEPA company (DE 3722795) employing stupalith filling agent is realized the insulation between the coil, and its practice is to make sheathed cable with coil, stupalith and stainless steel sleeve control.Its advantage is that manufacture craft is simple.Its shortcoming at first is that the sheathed cable external diameter is thicker, wire circle that can coiling in limited sensor internal space limited (about 10 circles), cause determining the coil induction reactance of coil electromagnetism sensing capability lower (less than 0.3 ohm), limited the sensitivity of electromagnetic sensor; Next is the narrow space in the sheathed cable, heart yearn line footpath wherein is thinner, (transmitting coil is about 50 ohm to the direct current resistance of coil, receiving coil is about 150 ohm) be far longer than the induction reactance of coil, the most energy consumptions that cause excitation power supply are in the heating of transmitting coil, and be used for the energy shortage 0.6% of electric magnetization, further limited the sensitivity of sensor.Because the sensitivity of sensor is low, sensor signal must be amplified significantly, and system stability is relatively poor.Zhejiang University (ZL 01255085.X) is in order to solve the high-temperature insulation problem at coil overcoat porcelain tube, recharge thermal insulation material on every side, operate cumbersome, and porcelain tube and thermal insulation material occupy than large space, can only adopt single coil structure, transducer sensitivity and stability are subjected to bigger restriction, do not reach practical level so far as yet.Another key issue of electromagnetic sensor is how to reduce background interference signal (comprising the signal drift that structured material temperature variation such as the variation of the background signal that transmitting coil produces and smelting equipment datum plate cause in receiving coil).AMEPA company (DE 3722795) adopts local additional electromagnetic shield and provides the way of multiple frequency current to reduce the interference of ladle datum plate temperature variation to sensor to transmitting coil.Its practice is that transmitting coil and receiving coil are produced in the same cell of sensor box (in fact being that transmitting coil and receiving coil are produced within the sheathed cable of same stainless steel sleeve pipe concurrently), and reference coil is produced on another insulated chamber of sensor box, or be placed on outside the sensor box, or electricity consumption signal imitation reference coil, so that the different parts additional electromagnetic shield material in sensor box.This makes receiving coil very near from transmitting coil, the coefficient of mutual inductance between transmitting coil and the receiving coil and the temperature coefficient of this coefficient of mutual inductance have been strengthened, thereby the background signal of receiving coil and this background signal have been strengthened with the variation of temperature amount, the signal drift amount that the signal drift amount that sensor self temperature variation produces causes greater than structured material temperature variation such as datum plates has directly influenced the stability of sensor.And the practice of additional electromagnetic shield material, particularly reference coil is shifted out the practice of sensor box, make reference coil and receiving coil be in different environment, the purpose of offsetting the environmental interference that receiving coil is subjected to by reference coil and additional frequency exciting current just is difficult to realize more.
The purpose of this invention is to provide a kind of sensitivity, stable, the reliable and simple electromagnetic type liquid metal of manufacture craft beam slag content detection device.
The object of the present invention is achieved like this: be installed in the sensor of liquid metal stream circumference and signal-transmitting cable and signal processor and formed liquid metal beam slag content detection device.Sensor has an endless metal shell, and each the layer line circle in the sensor is wound on respectively in the spiral groove on the insulation course.
Insulation course is made up of the insulating trip of with groove.When the insulating trip of with groove is circular layout in sensor, axially displaced along loop sensor piecewise, make the insulating trip of arranging with groove when expiring a week move axially a circle distance, but the groove on the insulating trip that is circular layout has so promptly constituted the spiral groove of coiling along loop sensor.
Be furnished with receiving coil, packed layer, transmitting coil and compensating coil successively from interior the ring to outer shroud in the sensor of the present invention, the signal of compensating coil and receiving coil is anti-phase addition in signal processor.
Packed layer of the present invention is made up of the insulation filling piece of with groove.
The outside of compensating coil of the present invention also has one deck to be wound on fastening coil in the spiral groove on the insulation course.
In the survey slag sensor of the present invention the insulating trip of with groove realized between each layer line circle of sensor and same layer line circle each the circle between insulation, this has just simplified sensor production technology, has reduced material cost, has shortened the fabrication cycle of sensor.The particularly important is along the coil of groove coiling and can the more number of turns of coiling also adopt thicker line footpath, thereby in the induction reactance that strengthens transmitting coil, reduced the direct current resistance of transmitting coil, finally strengthened exciting current, especially strengthen the energy share of excitation power supply electromagnetic radiation, improved the sensitivity of surveying the slag sensor.
The introducing of packed layer has been directed at the non-uniform Distribution of sensor interior loop in the survey slag sensor of the present invention, make transmitting coil far away apart from receiving coil, nearer apart from compensating coil, thereby reduced the background signal that transmitting coil produces in receiving coil, just can offset the background signal that transmitting coil produces with the compensating coil that the number of turns is less in the more receiving coil of the number of turns.In addition, the introducing of packed layer has strengthened the distance of liquid metal beam to compensating coil, the electromagnetic signal that produces in the receiving coil of the electromagnetic signal that vortex flow that transmitting coil produces in the liquid metal beam is produced in the less not only distance compensating coil far away of the number of turns but also close together more in the number of turns much smaller than this vortex flow.Thereby compensating coil is when offsetting the background signal that transmitting coil produces in receiving coil, and weakening of the useful signal that the vortex flow in the liquid towards metal beam produces in receiving coil is very little.Also have, electromagnetic structure materials such as datum plate are nearer apart from the less compensating coil of the number of turns as secondary electromagnetic radiator, and are far away apart from the receiving coil that the number of turns is more, help restraining the drift of the sensor signal that these structured materials cause.Hence one can see that, and packed layer has improved the signal to noise ratio (S/N ratio) of annular survey slag sensor effectively.
The differential type structure of receiving coil of the present invention and compensating coil, and the when bigger exciting current of the extraordinary noise of sensor etc. have guaranteed sensitivity, stability and the reliability of the height of liquid metal slag content detection device of the present invention.
The present invention is shown in Fig. 1 and Fig. 2 A-Fig. 2 D.
Fig. 1 surveys the slag plant system drawing
Fig. 2 A is a front view of surveying the slag sensor
Fig. 2 B is a vertical view of surveying the slag sensor
Fig. 2 C is the A-A profile of Figure 1B
Fig. 2 D is the partial enlarged drawing of Figure 1B
As an example, Fig. 1 has provided the system diagram of slag content detection device from the liquid metal beam that big bag flows out.Filling pipe end (18) is arranged at big bag (17) bottom of depositing liquid metal (16) among the figure, and liquid metal beam (19) is by filling pipe end (18) bag (21) in the perforate of slide plate (20) flows into.Electromagnetic type survey slag sensor (22) be installed in liquid metal beam (19) and filling pipe end (18) around, its outer rim side is adjacent with big bag datum plate (23), and brick cup under the big bag (24) is arranged on it, and upper slide mounting bracket (25) is arranged under it.The signal of sensor (22) is sent to signal processor (27) through cable (26).When the slag content in the liquid metal beam (19) surpassed the reservation value, signal processor (27) reported to the police and sends the signal of cutting out slide plate (20), bag (21) during the liquid metal that prevents to contain excessive slag flows into.
Fig. 2 A-Fig. 2 D has provided the structure and the principle of survey slag sensor (22).Surveying slag sensor (22) is annular, and a metal shell (1) is arranged.Metal shell (1) inner chamber is furnished with receiving coil (2), transmitting coil (3) and compensating coil (4) successively from encircling in the sensor to outer shroud.2 layers of receiving coil is wound in the spiral groove of insulation course (5) of 2 layers of with groove among the figure.The insulation filling layer (6) that with groove is arranged between receiving coil (2) and the transmitting coil (3).4 layers of transmitting coil (3) are wound on respectively in the spiral groove of insulation filling layer (6) and 3 layer insulatings (7) among the figure.1 layer of compensating coil (4) is wound in the spiral groove of a layer insulating (8) among the figure.The outside of compensating coil among the figure (4) also has one deck coil to constitute fastened layer (9), this layer is wound in the spiral groove of insulation course (10), is used for making the shape and the position of receiving coil (2), transmitting coil (3), compensating coil (4) and insulation course (5), packed layer (6), insulation course (7) and insulation course (8) in the sensor (22) to remain unchanged.Insulation course (5), (7), (8) and (10) are made up of collets (11), (13), (14) and (15) of with groove, and the insulation filling layer is made up of the insulation filling piece (12) of with groove.The insulating trip of with groove (11), (13), (14) and the insulation filling piece (12) of (15) and with groove when in the sensor (22) of horizontal positioned, successively being circular layout vertically, one by one along axially evenly displacement of loop sensor, make and arrange a full week and formation insulation course (5), (7), (8), (10) or during packed layer (6), insulating trip (11), (13) (14) and (15) and insulation filling piece (12) axially add up to be shifted a circle distance, insulation course (5) like this along loop sensor (22), (7), (8), (10) and packed layer (6) but on groove promptly constituted the spiral groove of coiling.Usually the girth of sensor (22) interior loop is much larger than the width of insulating trip (11), (13) (14), (15) and filling block (12), and the radius-of-curvature of the groove on insulating trip (11), (13) (14), (15) and the filling block (12) is slightly larger than the radius of the metal wire of wherein coiling, can guarantee that the coiling of coil in spiral groove carry out smoothly.Insulating trip (11), (13), (14), (15) and filling block (12) are made by resistant to elevated temperatures stupalith.
The exchange current that signal processor (27) produces feeds transmitting coil (3) through cable (26), produces vortex flow in liquid metal beam (19), and this vortex flow produces induced signal in receiving coil (2) and compensating coil (4).This 2 road signal is sent into signal processor (27) through cable (26) and is carried out anti-phase addition, and the background signal that transmitting coil (3) is produced in receiving coil (2) and compensating coil (4) is cancelled out each other.The introducing of packed layer (6) has strengthened the distance of receiving coil (2) with transmitting coil (3), reduced the background signal that transmitting coil (3) produces in receiving coil (2), thereby just can offset the background signal that transmitting coil (3) produces in the more receiving coil of the number of turns (2) with the less compensating coil of the number of turns (4).Compare with compensating coil (4), the number of turns of receiving coil (2) is more, the induced signal nearer apart from liquid metal beam (19), that the induced signal that the vortex flow that transmitting coil (3) produces in liquid metal beam (19) produces in receiving coil (2) produces in the less distance again of number of turns compensating coil (4) far away much larger than this vortex flow.Like this, signal processor (27) enters anti-phase addition when handling at the signal to receiving coil (2) and compensating coil (4), and just the overwhelming majority of the signal that the vortex flow in the liquid metal beam (19) is produced in receiving coil (2) has kept.Except that the background signal that transmitting coil (3) produces in receiving coil (2), the vortex flow that the electric current of transmitting coil (3) produces in big bag datum plate (23) and upper slide mounting bracket electromagnetic mediums such as (25) is the key factor that causes the signal drift of sensor (22).Datum plate among Fig. 1 (23) and upper slide mounting bracket metal materials such as (25) are nearer apart from the less compensating coil of the number of turns (4), far away apart from the more receiving coil of the number of turns (2), this version help reducing sensor (22) on every side the electromagnetic medium temperature variation to the interference effect of sensor.
Claims (5)
1, a kind of device that detects slag content in the liquid metal beam, it is made up of the sensor that is installed in the liquid metal stream circumference and signal cable and signal processor, sensor is made up of metal shell and coil, it is characterized in that, in the spiral groove of coil winding on insulation course.
2, device according to claim 1 is characterized in that, the spiral groove on the insulation course of support coil is formed to being shifted one by one along sensor axis by the insulating trip or the collets of with groove.
3, a kind of device that detects slag content in the liquid metal beam, it is made up of the sensor that is installed in the liquid metal stream circumference and signal cable and signal processor, sensor is made up of metal shell and receiving coil, transmitting coil and compensating coil, it is characterized in that between receiving coil in the sensor and the transmitting coil packed layer being arranged.
4, device according to claim 3 is characterized in that, the packed layer of sensor is consisted of the insulation filling layer of band spiral groove by the insulation filling piece of with groove.
5, device according to claim 3 is characterized in that, the fastening coil of one deck is arranged in the outside of compensating coil, in the spiral groove of fastening coil winding on insulation course.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031569803A CN1272628C (en) | 2003-09-17 | 2003-09-17 | Device for detecting slag content of liquid metal orifice |
| RU2006112605/02A RU2356684C2 (en) | 2003-09-17 | 2004-09-16 | Device for detection of slag content in molten metal stream |
| BRPI0414523-2B1A BRPI0414523B1 (en) | 2003-09-17 | 2004-09-16 | device for detecting slag content in liquid metal flux. |
| EP04762187.5A EP2366474B1 (en) | 2003-09-17 | 2004-09-16 | Device for detecting slag content in liquid metal stream |
| PCT/CN2004/001053 WO2005035168A1 (en) | 2003-09-17 | 2004-09-16 | Device for detecting slag content in liquid metal stream |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031569803A CN1272628C (en) | 2003-09-17 | 2003-09-17 | Device for detecting slag content of liquid metal orifice |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1598559A true CN1598559A (en) | 2005-03-23 |
| CN1272628C CN1272628C (en) | 2006-08-30 |
Family
ID=34427780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031569803A Expired - Lifetime CN1272628C (en) | 2003-09-17 | 2003-09-17 | Device for detecting slag content of liquid metal orifice |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2366474B1 (en) |
| CN (1) | CN1272628C (en) |
| BR (1) | BRPI0414523B1 (en) |
| RU (1) | RU2356684C2 (en) |
| WO (1) | WO2005035168A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866847A (en) * | 2016-04-05 | 2016-08-17 | 衡阳镭目科技有限责任公司 | Apparatus for monitoring existence of liquid metal |
| CN106415304A (en) * | 2014-01-24 | 2017-02-15 | 高通股份有限公司 | Methods, apparatuses, and devices for processing positioning reference signals |
| CN108607968A (en) * | 2016-12-12 | 2018-10-02 | 上海梅山钢铁股份有限公司 | A kind of forecasting procedure of the continuous casting tundish slag based on Lower proterozoic group |
| CN109996622A (en) * | 2016-11-29 | 2019-07-09 | 里弗雷克特里知识产权两合公司 | For detecting the method and mechanism that outpour the parameter in portion in the container of metallurgy |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015119548B4 (en) | 2015-07-13 | 2022-06-23 | Sms Group Gmbh | measuring device |
| ES2831829T3 (en) * | 2015-12-01 | 2021-06-09 | Refractory Intellectual Property Gmbh & Co Kg | Sliding closure on the nozzle of a metallurgical vessel |
| CN105628137B (en) * | 2016-02-22 | 2020-01-24 | 中国原子能科学研究院 | Sodium liquid level detection device |
| RU2662850C2 (en) * | 2016-03-09 | 2018-07-31 | Открытое акционерное общество ЕВРАЗ Нижнетагильский металлургический комбинат | Slag in the metal melt flow detection method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1585496A (en) * | 1976-05-20 | 1981-03-04 | Atomenergi Ab | Coil arrangement for electro-magnetic measurements |
| DE3142681A1 (en) * | 1981-10-24 | 1983-05-05 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Eddy current measuring device for continuous casting plants |
| FR2532208A1 (en) * | 1982-08-24 | 1984-03-02 | Siderurgie Fse Inst Rech | Apparatus for detecting the presence of slag in runners |
| CH660701A5 (en) * | 1983-08-18 | 1987-06-15 | Metacon Ag | DEVICE FOR DETECTING THE PRESENCE OF METALLIC MELT IN A FLOW CHANNEL OF A METALLURGICAL OVEN OR A SPRAYER. |
| DE3439369A1 (en) * | 1984-10-27 | 1986-04-30 | AMP Angewandte Meßtechnik und Prozeßsteuerung GmbH, 5100 Aachen | METHOD AND DEVICE FOR DETECTING SLAG |
| DE3722795A1 (en) * | 1987-07-10 | 1989-01-19 | Amepa | DEVICE FOR DETECTING SLAG FLOWING IN A FLOW OF A METAL MELT |
| US4810988A (en) * | 1988-06-20 | 1989-03-07 | Westinghouse Electric Corp. | Slag detector transducer coil assembly |
| CN1128354C (en) * | 2001-11-29 | 2003-11-19 | 浙江大学 | Sensor for obtaining scoria flow-out signal during steel ladle casting |
-
2003
- 2003-09-17 CN CNB031569803A patent/CN1272628C/en not_active Expired - Lifetime
-
2004
- 2004-09-16 BR BRPI0414523-2B1A patent/BRPI0414523B1/en not_active IP Right Cessation
- 2004-09-16 EP EP04762187.5A patent/EP2366474B1/en not_active Expired - Lifetime
- 2004-09-16 RU RU2006112605/02A patent/RU2356684C2/en active
- 2004-09-16 WO PCT/CN2004/001053 patent/WO2005035168A1/en active Application Filing
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106415304A (en) * | 2014-01-24 | 2017-02-15 | 高通股份有限公司 | Methods, apparatuses, and devices for processing positioning reference signals |
| CN105866847A (en) * | 2016-04-05 | 2016-08-17 | 衡阳镭目科技有限责任公司 | Apparatus for monitoring existence of liquid metal |
| CN109996622A (en) * | 2016-11-29 | 2019-07-09 | 里弗雷克特里知识产权两合公司 | For detecting the method and mechanism that outpour the parameter in portion in the container of metallurgy |
| CN109996622B (en) * | 2016-11-29 | 2022-03-29 | 里弗雷克特里知识产权两合公司 | Method and device for detecting a variable in a spout of a metallurgical vessel |
| CN108607968A (en) * | 2016-12-12 | 2018-10-02 | 上海梅山钢铁股份有限公司 | A kind of forecasting procedure of the continuous casting tundish slag based on Lower proterozoic group |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2005035168A1 (en) | 2005-04-21 |
| RU2356684C2 (en) | 2009-05-27 |
| EP2366474A4 (en) | 2011-09-21 |
| EP2366474B1 (en) | 2013-05-22 |
| EP2366474A1 (en) | 2011-09-21 |
| RU2006112605A (en) | 2007-11-10 |
| BRPI0414523A (en) | 2006-11-07 |
| BRPI0414523B1 (en) | 2013-06-18 |
| CN1272628C (en) | 2006-08-30 |
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: TIAN ZHIHENG Free format text: FORMER OWNER: JIANG JIANG Effective date: 20090410 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20090410 Address after: Hunan Province, Hengyang Zhengxiang District Furong Road No. 21 Patentee after: Tian Zhiheng Address before: Retired school, University of South China, Hunan, Hengyang Patentee before: Jiang Hong |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20060830 |